Grate-bar.



No. 852,739. PATENTED MAY 7,-1907.

v J. A. O'NEILL.

GRATE BAR.

APPLICATION FILED OOT.3. 1906.

W'Zhzesses UNITED STATES ATENT @FFTQE.

GRATE-BAR.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed October 3,1906- Serial No. 337,157-

To aZZ whom it Wtay concern.-

Be it known that I, JAMEs A. ONEILL, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Grate- Bars, of which the following is a specification, reference being had therein to the accompanying drawing, in which Figure l is a plan view of the grate bar; Fig. 2 a rear edge view Fig. 3 a bottom view thereof; Fig. 4 an end view Fig. 5 a transverse vertical sectional View on the line VV of Fig. 1; and Fig. 6 a detail vertical section'al view of a portion of a grate with my grate bar in position thereon.

This invention relates to improvements in grate bars designed for use in that class of grates wherein the bars are placed in a steplike formation with the rear portion of one bar, that is, the portion next to the fire, projecting over the forward portion of the next bar below, so that the bars of the grate overlap and the grate inclines rearwardly and downwardly, the upper surface of each grate bar being substantially horizontal.

One of the many objects of the invention is to provide such a grate bar which will not be warped by the heat from the fire, and which will be thoroughly protected by the ashes deposited thereon.

Another object of the invention is to taper the bar transversely from its rear edge to its forward edge, so that the protected forward edge will be light and thin and the rear edge which is exposed to the fire will be heavy and of such formation as to withstand the heat.

Another object of the invention is to groove the bar transversely on its upper and lower surfaces, said grooves deepening from the forward edge to the rear edge of the bar, and the rear ends of said grooves being open.

Referring to the various parts by numerals, 1 designates the grate bar, 2 the upright support therefor, and 3 the bearer or rocker bar which carries the upright supports. It will be understood that the rocker bar in practice carries a considerable number of supports and grate bars, but only two are shown in the drawing for the purpose of illustration.

Each grate bar is tapered from its rear edge to its forward edge, as shown clearly in Figs. 4 and 5, and in the upper and lower surfaces thereof transverse grooves 4 and ribs 5 are formed. The grooves increase in depth from the forward edge of the grate bar to the rear edge thereof, and consequently the ribs increase in height correspondingly. The grooves are open at the rear edge of the grate bar and are merged into the upper surface of the grate bar at the forward edge thereof, so that the extreme forward edge of the grate bar is practically smooth on its upper and lower surfaces. The rear ends of the grooves are open so that ashes, which lodge on the grate bars, may at any time be forced therefrom through the open ends of the grooves. By reference to Fig. 2, it will be seen that the ribs on the upper surface of the bar are directly over the grooves in the lower surface thereof, the ribs on the lower surface thereof being directly below the grooves on the upper surface. By thus staggering the ribs and grooves the bar is strengthened, and prevented from warping. One of the main objects of thus grooving the grate bar on its upper and lower surfaces is to provide means for holding enough ash on the upper surface of the bar to prevent it being burned, and to increase the radiating area of the bottoin of the bar. The ribs and grooves are narrow transversely and the grooves are deep enough to hold the desired amount of ashes. Another purpose of thus grooving the upper and lower surfaces of the bar is to permit it to expand laterally without distortion, it being well known that the lateral expansion will be taken up by the ribs and in that part of the bar which connects the .ribs on the upper surface with the adjoining ribs on the lower surface, without distorting the bar at its ends, and without perceptibly elongating it. Another advantage of the grooved surfaces is that the maximum amount of air space may be had be tween the overlapped edges of the bars, and that when the bars are in contact there will be a considerable air space or passage between them, and that because of this grooving of the bars said air space between the bars will not be closed at any point in the rocking movement of the bars. It will also be noted that the grooving of the under surface of the bars provided a maximum area of radiating surface practically possible with grate bars of this type and that, therefore, the temperature of the bar will be comparatively low.

Near the forward edge of each bar downward extending enlargements 6 are formed on the under side thereof. Through these enlargements apertures 7 are formed to receive the attaching bolts. In arranging the bars the upper bars will extend over the lower bar about one-third of its width, that is to say, just sufficiently to bring the rear edge of the upper bar beyond the fastening bolts, and directly over the deeply grooved part of the lower bar. By this means the forward edge of the bar is protected.

It will be seen that at the rear edge of the bar, where it is subjected to' the greatest heat, is formed the deepest part of the grooves and the greatest thickness of ribs. It is obvious that at this point the greatest amount of ashes will accummulate in the grooves, and the bar will have the greatest protection at that point from the fire. It is also the heaviest and strongest part of the bar and the best able to withstand heat.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A grate bar tapered transversely from its rear edge to its forward edge and formed with transverse grooves and ribs on its upper and lower surfaces, said grooves being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof and the ribs being correspondingly higher at the rear edge of the bar and tapering toward the forward edge thereof, the ribs and grooves merging into the upper surface of the bar at the forward edge thereof, so that said forward edge is substantially smooth throughout, the rear ends of the grooves being open, and means whereby said grate bar may be secured to a support.

2. A grate bar tapered transversely from its rear edge to its forward edge and formed with transverse grooves and ribs on its upper and lower surfaces, said grooves being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof, and the ribs being highest at the rear edge of the bar and tapering toward the forward edge thereof, the rear ends of the grooves being open, downward extending enlargements formed on the lower surfaces of the bar at the forward edge thereof, said enlargements extending toward the rear edge of the grate bar and being tapered from the forward edge toward said rear edge, whereby said enlargements form bearings on which the bar may be supported, the forward ends of said enlargements being apertured to receive the attaching bolts.

3. A grate bar formed with transverse rooves and ribs on its upper and lower suraces, said grooves on the upper surface of the bar being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof, and the ribs being correspondingly higher at the rear edge of the bar and tapering toward the forward edge thereof, the ribs and grooves merging into the upper surface of the bar at the forward edge thereof so that the upper surface of the bar at its forward edge is substantially smooth throughout, the rear ends of the grooves on the upper and lower surfaces of the bar being open.

4. grate bar tapered transversely from its rear edge to its forward edge and formed with transverse grooves and ribs on its upper and lower surfaces, said grooves being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof, the ribs and grooves on the upper and lower surfaces of the bar merging into a substantially flat surface at the forward edge thereof, so that said forward edge is thinner than the rear edge and smooth throughout its length, the rear ends of the grooves being 5. An inclined grate consisting of a plurality of pivotally mounted grate bars arranged in stepped and overlapped relation, each of said bars being tapered transversely from its rear edge to its forward edge and formed with transverse grooves and ribs on its upper and lower surfaces, said grooves being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof, the ribs and grooves merging into the upper and lower surfaces of the bar at the forward edge thereof, so that said forward edge is substantially smooth throughout and the rear ends of the grooves are open.

6. A grate bar tapered transversely from its rear edge to its forward edge and formed with transverse grooves and ribs on its upper and lower surfaces, said grooves being deepest at the rear edge of the bar and growing shallower toward the forward edge thereof and the ribs being correspondingly higher at v the rear edge of the bar and tapering toward the forward edge thereof, the rear ends of the grooves being open.

In testimony whereof I hereunto affix my signature in the presence of two witnesses this 28 dayof September, 1906.

JAMES A. ONEILL.

Witnesses:

THos. ALLsoP, GEORGE MCKINNEY. 

